navigation clock

例句：

1. 1. The navigation clock on the ship's bridge is an essential tool for pilots.
   船上的导航钟是飞行员必不可少的工具。
2. 2. The navigation clock was set to ensure that we were always on time.
   导航钟被设定为确保我们总是准时。
3. 3. The navigation clock helped us navigate through the fog and reach our destination safely.
   导航钟帮助我们在雾中导航，安全到达目的地。